Among the proliferation of Protestant sects across England in the seventeenth century, a remarkable number began adopting demonstratively Jewish ritual practices. From circumcision to Sabbath-keeping and dietary laws, their actions led these movements were labelled by their contemporaries as Judaizers, with various motives proposed. Were these Judaizing steps an excrescence of over-exuberant biblicism? Were they a by-product of Protestant apocalyptic...